Looking at return only, and comparing firearms to all other investment options, guns are a bad choice, as several have advised. But then, maybe what you're really asking is, "If I was going to buy a gun or two or three anyway, what kinds would be best to sink $10 grand into ... guns that shouldn't lose value and might even be expected to gain over the next 30 years?" That's a perfectly sensible question.
I love guns and have at times been a bit obsessed with them, buying and selling more than I can remember without looking at my records. My collection is now small by this group's standards, as most have become college tuition, etc. Early-on, I bought rather wildly and overpaid for many. But I narrowed my interests and started learning all I could, especially about guns that I felt were "overdue" for a surge in interest and price. Now I know enough about the guns I like that I almost always buy "right," and then at least break even if I choose to sell. Knowing more about a gun than a dealer does is a very rare situation, but has, on a few lucky occasions, allowed me to do a lot better than break even.
For me, it's certainly not a business, or even an investment, but only a hobby that partially "pays its way." You need to make your own decisions as to what to buy, but remember that, even though guns aren't a great investment, some fairly universal investment principles can be applied to help you make better decisions. Happy hunting. TT